<html>
    <head>
        <script src="./vue.js"></script>
    </head>
    <body>
        <div id="app">
             <div><p>{{}}</p ></div>
         </div>
    </body>
    <script>
        var app=new Vue({
            el: "#app",
            data: {
                msg: "I am Vue",
            }
        });
        console.log(app.$data.msg)
    </script>
</html>